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New data on the non-indigenous gammarids in the Vistula Delta and the Vistula Lagoon

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Surowiec J., Dobrzycka-Krahel A.

Oceanologia

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2008

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tom 50

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nr 3

443-447

This communication reports on the occurrence of non-indigenous gammarid species of Ponto-Caspian and of North American origin – in the lower course of the River Vistula, in its Delta and in the Vistula Lagoon.

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Changes in species composition of the genus Gammarus Fabr. in Puck Bay

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Jeczmien W., Szaniawska A.

Oceanologia

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2000

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tom 42

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nr 1

This paper describes the current species composition of the genus Gammarus in Puck Bay (western Gulf of Gdańsk, Poland).Sa mples were taken at 9 shallow (ca 0.4 m deep) and 4 deeper (ca 10 m) stations from April 1997 to March 1998. Six Gammarus species were recorded. Gammarus salinus was the most numerous, making up 34.95% of the total of identified amphipod specimens. This species was common throughout the bay but rarely predominant. G. zaddachi (34.75%) was dominant in the northern part of the bay from January to April and was found in almost 2/3 of samples.Less numerous were G. oceanicus (19.15%), common in the southern and eastern parts of Puck Bay, and G. duebeni (9.85%), prevalent in shallow and rocky locations. G. inequicauda and G. locusta made up only 1.13% and 0.12% of the total amphipod material respectively. The species composition of the genus varied considerably not only from one sampling locality to another but also from season to season.I t is possible that two species (G. locusta and G. inequicauda) are currently withdrawing from Puck Bay.

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An attempt to determine the intermediate host for Pomphorhynchus laevis [Acanthocephala] in the Baltic Sea

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Ziolkowska M., Rokicki J.

Acta Ichthyologica et Piscatoria

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2003

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tom 33

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nr 1

Background. A number of fish species in the Baltic Sea are known as definitive hosts for Pomphorhynchus laevis but it is unclear which of the Gammarus species is the intermediate host of this parasite. The aim of the present paper was to identify this host in brackish waters of the Baltic Sea. Materials and Methods. A total of 531 scuds (G. salinus, G. zaddachi, and G. duebeni) were collected from the Gulf of Gdańsk and the Pomeranian Bay, respectively to determine the infection rate of those amphipods in the natural environment. Under experimental condition the scuds were exposed to infection with P. laevis in two different arrangements. In treatment one, the amphipods were kept, from May to July, in the same tank with infected flounder. In treatment two, 197 scuds were exposed to eggs of P. laevis, taken from dissected female acanthocephalans. Results. Scuds sampled from two areas of the Baltic Sea were not infected with P. laevis. Out of three Gammarus species cohabiting with infected flounders only G. zaddachi became infected. None of the scuds exposed directly to the eggs of the parasites became intermediate host of the acanthocephalan studied. Conclusion. span class="ita">Gammarus zaddachi is probably an intermediate host for Pomphorhynchus laevis in the Baltic Sea.

Ograniczanie wyników

2 Oceanologia

1 Acta Ichthyologica et Piscatoria

1 Dobrzycka-Krahel A.

1 Jeczmien W.

1 Rokicki J.

1 Surowiec J.

1 Szaniawska A.

1 Ziolkowska M.

1 2008

1 2003

1 2000

New data on the non-indigenous gammarids in the Vistula Delta and the Vistula Lagoon

Changes in species composition of the genus Gammarus Fabr. in Puck Bay

An attempt to determine the intermediate host for Pomphorhynchus laevis [Acanthocephala] in the Baltic Sea